There are going to be times we play Abbot of Keral Keep on turn three, but do not have a third land
If you are willing to pay for the service, Beckett has been an industry standard for trading card valuation (well beyond just MTG) for generations
At its lowest, it is a 1/1 creature, but that number increases for every blue permanent you control
Theres a Hardened Scales which is nice, especially for Pioneer or Modern players who want some new fancy artwork for their decks
Landfall Whenever a land you control enters, put a +1/+1 counter on target Elemental you control
I did have a Miirym, Sentinel Wyrm Commander deck briefly, but I didnt like how overpowered it was to have a card that powerful sitting in the command zone